forked from OSchip/llvm-project
359 lines
10 KiB
LLVM
359 lines
10 KiB
LLVM
; RUN: opt < %s -instcombine -S | FileCheck %s
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target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
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target triple = "x86_64-unknown-linux-gnu"
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define i32 @foo1(i32* %a) #0 {
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entry:
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%0 = load i32, i32* %a, align 4
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; Check that the alignment has been upgraded and that the assume has not
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; been removed:
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; CHECK-LABEL: @foo1
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; CHECK-DAG: load i32, i32* %a, align 32
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; CHECK-DAG: call void @llvm.assume
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; CHECK: ret i32
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%ptrint = ptrtoint i32* %a to i64
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%maskedptr = and i64 %ptrint, 31
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%maskcond = icmp eq i64 %maskedptr, 0
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tail call void @llvm.assume(i1 %maskcond)
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ret i32 %0
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}
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define i32 @foo2(i32* %a) #0 {
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entry:
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; Same check as in @foo1, but make sure it works if the assume is first too.
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; CHECK-LABEL: @foo2
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; CHECK-DAG: load i32, i32* %a, align 32
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; CHECK-DAG: call void @llvm.assume
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; CHECK: ret i32
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%ptrint = ptrtoint i32* %a to i64
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%maskedptr = and i64 %ptrint, 31
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%maskcond = icmp eq i64 %maskedptr, 0
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tail call void @llvm.assume(i1 %maskcond)
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%0 = load i32, i32* %a, align 4
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ret i32 %0
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}
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declare void @llvm.assume(i1) #1
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define i32 @simple(i32 %a) #1 {
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entry:
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; CHECK-LABEL: @simple
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; CHECK: call void @llvm.assume
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; CHECK: ret i32 4
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%cmp = icmp eq i32 %a, 4
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tail call void @llvm.assume(i1 %cmp)
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ret i32 %a
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}
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define i32 @can1(i1 %a, i1 %b, i1 %c) {
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entry:
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%and1 = and i1 %a, %b
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%and = and i1 %and1, %c
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tail call void @llvm.assume(i1 %and)
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; CHECK-LABEL: @can1
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; CHECK: call void @llvm.assume(i1 %a)
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; CHECK: call void @llvm.assume(i1 %b)
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; CHECK: call void @llvm.assume(i1 %c)
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; CHECK: ret i32
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ret i32 5
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}
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define i32 @can2(i1 %a, i1 %b, i1 %c) {
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entry:
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%v = or i1 %a, %b
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%w = xor i1 %v, 1
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tail call void @llvm.assume(i1 %w)
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; CHECK-LABEL: @can2
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; CHECK: %[[V1:[^ ]+]] = xor i1 %a, true
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; CHECK: call void @llvm.assume(i1 %[[V1]])
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; CHECK: %[[V2:[^ ]+]] = xor i1 %b, true
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; CHECK: call void @llvm.assume(i1 %[[V2]])
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; CHECK: ret i32
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ret i32 5
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}
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define i32 @bar1(i32 %a) #0 {
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entry:
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%and1 = and i32 %a, 3
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; CHECK-LABEL: @bar1
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; CHECK: call void @llvm.assume
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; CHECK: ret i32 1
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%and = and i32 %a, 7
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%cmp = icmp eq i32 %and, 1
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tail call void @llvm.assume(i1 %cmp)
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ret i32 %and1
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}
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define i32 @bar2(i32 %a) #0 {
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entry:
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; CHECK-LABEL: @bar2
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; CHECK: call void @llvm.assume
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; CHECK: ret i32 1
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%and = and i32 %a, 7
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%cmp = icmp eq i32 %and, 1
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tail call void @llvm.assume(i1 %cmp)
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%and1 = and i32 %a, 3
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ret i32 %and1
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}
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define i32 @bar3(i32 %a, i1 %x, i1 %y) #0 {
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entry:
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%and1 = and i32 %a, 3
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; Don't be fooled by other assumes around.
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; CHECK-LABEL: @bar3
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; CHECK: call void @llvm.assume
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; CHECK: ret i32 1
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tail call void @llvm.assume(i1 %x)
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%and = and i32 %a, 7
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%cmp = icmp eq i32 %and, 1
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tail call void @llvm.assume(i1 %cmp)
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tail call void @llvm.assume(i1 %y)
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ret i32 %and1
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}
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define i32 @bar4(i32 %a, i32 %b) {
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entry:
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%and1 = and i32 %b, 3
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; CHECK-LABEL: @bar4
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; CHECK: call void @llvm.assume
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; CHECK: call void @llvm.assume
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; CHECK: ret i32 1
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%and = and i32 %a, 7
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%cmp = icmp eq i32 %and, 1
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tail call void @llvm.assume(i1 %cmp)
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%cmp2 = icmp eq i32 %a, %b
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tail call void @llvm.assume(i1 %cmp2)
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ret i32 %and1
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}
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define i32 @icmp1(i32 %a) #0 {
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; CHECK-LABEL: @icmp1(
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; CHECK-NEXT: [[CMP:%.*]] = icmp sgt i32 [[A:%.*]], 5
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; CHECK-NEXT: tail call void @llvm.assume(i1 [[CMP]])
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; CHECK-NEXT: ret i32 1
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;
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%cmp = icmp sgt i32 %a, 5
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tail call void @llvm.assume(i1 %cmp)
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%conv = zext i1 %cmp to i32
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ret i32 %conv
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}
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define i32 @icmp2(i32 %a) #0 {
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; CHECK-LABEL: @icmp2(
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; CHECK-NEXT: [[CMP:%.*]] = icmp sgt i32 [[A:%.*]], 5
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; CHECK-NEXT: tail call void @llvm.assume(i1 [[CMP]])
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; CHECK-NEXT: ret i32 0
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;
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%cmp = icmp sgt i32 %a, 5
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tail call void @llvm.assume(i1 %cmp)
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%t0 = zext i1 %cmp to i32
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%lnot.ext = xor i32 %t0, 1
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ret i32 %lnot.ext
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}
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; If the 'not' of a condition is known true, then the condition must be false.
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define i1 @assume_not(i1 %cond) {
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; CHECK-LABEL: @assume_not(
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; CHECK-NEXT: [[NOTCOND:%.*]] = xor i1 [[COND:%.*]], true
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; CHECK-NEXT: call void @llvm.assume(i1 [[NOTCOND]])
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; CHECK-NEXT: ret i1 false
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;
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%notcond = xor i1 %cond, true
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call void @llvm.assume(i1 %notcond)
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ret i1 %cond
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}
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declare void @escape(i32* %a)
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; Canonicalize a nonnull assumption on a load into metadata form.
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define i1 @nonnull1(i32** %a) {
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; CHECK-LABEL: @nonnull1(
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; CHECK-NEXT: [[LOAD:%.*]] = load i32*, i32** %a, align 8, !nonnull !6
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; CHECK-NEXT: tail call void @escape(i32* nonnull [[LOAD]])
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; CHECK-NEXT: ret i1 false
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;
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%load = load i32*, i32** %a
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%cmp = icmp ne i32* %load, null
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tail call void @llvm.assume(i1 %cmp)
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tail call void @escape(i32* %load)
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%rval = icmp eq i32* %load, null
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ret i1 %rval
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}
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; Make sure the above canonicalization applies only
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; to pointer types. Doing otherwise would be illegal.
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define i1 @nonnull2(i32* %a) {
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; CHECK-LABEL: @nonnull2(
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; CHECK-NEXT: [[LOAD:%.*]] = load i32, i32* %a, align 4
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; CHECK-NEXT: [[CMP:%.*]] = icmp ne i32 [[LOAD]], 0
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; CHECK-NEXT: tail call void @llvm.assume(i1 [[CMP]])
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; CHECK-NEXT: [[RVAL:%.*]] = icmp eq i32 [[LOAD]], 0
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; CHECK-NEXT: ret i1 [[RVAL]]
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;
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%load = load i32, i32* %a
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%cmp = icmp ne i32 %load, 0
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tail call void @llvm.assume(i1 %cmp)
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%rval = icmp eq i32 %load, 0
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ret i1 %rval
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}
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; Make sure the above canonicalization does not trigger
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; if the assume is control dependent on something else
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define i1 @nonnull3(i32** %a, i1 %control) {
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; CHECK-LABEL: @nonnull3(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: [[LOAD:%.*]] = load i32*, i32** %a, align 8
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; CHECK-NEXT: br i1 %control, label %taken, label %not_taken
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; CHECK: taken:
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; CHECK-NEXT: [[CMP:%.*]] = icmp ne i32* [[LOAD]], null
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; CHECK-NEXT: tail call void @llvm.assume(i1 [[CMP]])
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; CHECK-NEXT: [[RVAL:%.*]] = icmp eq i32* [[LOAD]], null
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; CHECK-NEXT: ret i1 [[RVAL]]
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; CHECK: not_taken:
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; CHECK-NEXT: ret i1 true
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;
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entry:
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%load = load i32*, i32** %a
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%cmp = icmp ne i32* %load, null
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br i1 %control, label %taken, label %not_taken
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taken:
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tail call void @llvm.assume(i1 %cmp)
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%rval = icmp eq i32* %load, null
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ret i1 %rval
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not_taken:
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ret i1 true
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}
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; Make sure the above canonicalization does not trigger
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; if the path from the load to the assume is potentially
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; interrupted by an exception being thrown
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define i1 @nonnull4(i32** %a) {
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; CHECK-LABEL: @nonnull4(
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; CHECK-NEXT: [[LOAD:%.*]] = load i32*, i32** %a, align 8
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; CHECK-NEXT: tail call void @escape(i32* [[LOAD]])
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; CHECK-NEXT: [[CMP:%.*]] = icmp ne i32* [[LOAD]], null
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; CHECK-NEXT: tail call void @llvm.assume(i1 [[CMP]])
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; CHECK-NEXT: [[RVAL:%.*]] = icmp eq i32* [[LOAD]], null
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; CHECK-NEXT: ret i1 [[RVAL]]
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;
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%load = load i32*, i32** %a
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;; This call may throw!
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tail call void @escape(i32* %load)
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%cmp = icmp ne i32* %load, null
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tail call void @llvm.assume(i1 %cmp)
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%rval = icmp eq i32* %load, null
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ret i1 %rval
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}
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; PR35846 - https://bugs.llvm.org/show_bug.cgi?id=35846
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define i32 @assumption_conflicts_with_known_bits(i32 %a, i32 %b) {
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; CHECK-LABEL: @assumption_conflicts_with_known_bits(
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; CHECK-NEXT: tail call void @llvm.assume(i1 false)
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; CHECK-NEXT: ret i32 0
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;
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%and1 = and i32 %b, 3
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%B1 = lshr i32 %and1, %and1
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%B3 = shl nuw nsw i32 %and1, %B1
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%cmp = icmp eq i32 %B3, 1
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tail call void @llvm.assume(i1 %cmp)
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%cmp2 = icmp eq i32 %B1, %B3
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tail call void @llvm.assume(i1 %cmp2)
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ret i32 %and1
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}
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; PR37726 - https://bugs.llvm.org/show_bug.cgi?id=37726
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; There's a loophole in eliminating a redundant assumption when
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; we have conflicting assumptions. Verify that debuginfo doesn't
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; get in the way of the fold.
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define void @debug_interference(i8 %x) {
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; CHECK-LABEL: @debug_interference(
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; CHECK-NEXT: [[CMP1:%.*]] = icmp eq i8 [[X:%.*]], 0
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; CHECK-NEXT: tail call void @llvm.dbg.value(metadata i32 5, metadata !7, metadata !DIExpression()), !dbg !9
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; CHECK-NEXT: tail call void @llvm.assume(i1 [[CMP1]])
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; CHECK-NEXT: tail call void @llvm.dbg.value(metadata i32 5, metadata !7, metadata !DIExpression()), !dbg !9
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; CHECK-NEXT: tail call void @llvm.dbg.value(metadata i32 5, metadata !7, metadata !DIExpression()), !dbg !9
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; CHECK-NEXT: tail call void @llvm.assume(i1 false)
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; CHECK-NEXT: ret void
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;
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%cmp1 = icmp eq i8 %x, 0
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%cmp2 = icmp ne i8 %x, 0
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tail call void @llvm.assume(i1 %cmp1)
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tail call void @llvm.dbg.value(metadata i32 5, metadata !1, metadata !DIExpression()), !dbg !9
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tail call void @llvm.assume(i1 %cmp1)
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tail call void @llvm.dbg.value(metadata i32 5, metadata !1, metadata !DIExpression()), !dbg !9
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tail call void @llvm.assume(i1 %cmp2)
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tail call void @llvm.dbg.value(metadata i32 5, metadata !1, metadata !DIExpression()), !dbg !9
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tail call void @llvm.assume(i1 %cmp2)
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ret void
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}
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; This would crash.
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; Does it ever make sense to peek through a bitcast of the icmp operand?
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define i32 @PR40940(<4 x i8> %x) {
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; CHECK-LABEL: @PR40940(
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; CHECK-NEXT: [[SHUF:%.*]] = shufflevector <4 x i8> [[X:%.*]], <4 x i8> undef, <4 x i32> <i32 1, i32 1, i32 2, i32 3>
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; CHECK-NEXT: [[T2:%.*]] = bitcast <4 x i8> [[SHUF]] to i32
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; CHECK-NEXT: [[T3:%.*]] = icmp ult i32 [[T2]], 65536
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; CHECK-NEXT: call void @llvm.assume(i1 [[T3]])
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; CHECK-NEXT: ret i32 [[T2]]
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;
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%shuf = shufflevector <4 x i8> %x, <4 x i8> undef, <4 x i32> <i32 1, i32 1, i32 2, i32 3>
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%t2 = bitcast <4 x i8> %shuf to i32
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%t3 = icmp ult i32 %t2, 65536
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call void @llvm.assume(i1 %t3)
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ret i32 %t2
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}
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declare void @llvm.dbg.value(metadata, metadata, metadata)
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!llvm.dbg.cu = !{!0}
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!llvm.module.flags = !{!5, !6, !7, !8}
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!0 = distinct !DICompileUnit(language: DW_LANG_C, file: !3, producer: "Me", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: null, retainedTypes: null, imports: null)
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!1 = !DILocalVariable(name: "", arg: 1, scope: !2, file: null, line: 1, type: null)
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!2 = distinct !DISubprogram(name: "debug", linkageName: "debug", scope: null, file: null, line: 0, type: null, isLocal: false, isDefinition: true, scopeLine: 1, flags: DIFlagPrototyped, isOptimized: true, unit: !0)
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!3 = !DIFile(filename: "consecutive-fences.ll", directory: "")
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!5 = !{i32 2, !"Dwarf Version", i32 4}
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!6 = !{i32 2, !"Debug Info Version", i32 3}
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!7 = !{i32 1, !"wchar_size", i32 4}
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!8 = !{i32 7, !"PIC Level", i32 2}
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!9 = !DILocation(line: 0, column: 0, scope: !2)
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attributes #0 = { nounwind uwtable }
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attributes #1 = { nounwind }
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